May, 2016

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Scottish Nature Notes

Keep up to date with the latest wildlife and nature news in Scotland. Regular blogs from RSPB Scotland's conservation teams across the country. Writing about Scotland's amazing wildlife & natural environment.
  • Sea eagles return: a forty year success story

    Sea eagles return: a forty year success story

    RSPB Scotland’s Paul Walton and Richard Evans reflect on the successful reintroduction programme that brought sea eagles back to Scotland after an absence of nearly 60 years.  

    The sight of a sea eagle provokes delight and excitement. Yet, this sight – so iconic in Scotland – was absent for much of the 20th century, until a conservation effort brought the species back to our country.

    Also known as white-tailed eagles, sea eagles were once widespread across Britain and Ireland. A steady decline from mediaeval times is evident, but the Victorian era brought intense persecution against birds of prey and other predators seen as competing with sporting estates for game and fish.  The remaining number of sea eagles plummeted and in 1916 the last known surviving one, an albino female, was shot at North Roe in Shetland.

    This loss of these eagles was huge not only for Scotland’s ecology, but also culturally. Archaeological and historical evidence indicates that sea eagles were incredibly significant to Scottish people. In Orkney the Tomb of the Eagles, a Neolithic burial tomb at Isbister, South Ronaldsay famously contains their bones, while a Pictish symbol stones depict beautifully carved birds, unequivocably recognisable as sea eagles.

    As the conservation movement developed through the 20th century, reversing the loss of this these eagles from our native wildlife heritage became seen as a key imperative. Worldwide, sea eagle populations were struggling, adding urgency to bring them back to Scotland.

    Three factors were crucial to the beginning of a reintroduction programme here. Robust UK legislation protecting wild bird species, including birds of prey - long advocated by the RSPB - entered the statutes, along with the confirmation that it was deliberate killing by people that had led to the loss of sea eagles here. These factors, combined with nearby Norway having a healthy population, spurred on conservationists to push for the return of sea eagles to Scotland.

    The reintroduction programme became a reality in 1975 run by the Nature Conservancy Council, now Scottish Natural Heritage (SNH) beginning on the island of Rum. Young birds were brought over from Norway, in partnership with Norwegian conservationists and authorities, and released into Scotland.

    Yet, this was only the start of the story.

    Sea eagles are long lived birds that don’t start to breed until they are at least four or five years old and have a naturally slow breeding rate. This meant that the new population in Scotland could only ever increase relatively slowly. It was 10 years before the first sea eagle chick successfully fledged on Mull in 1985, thanks in large part to wardening work by RSPB Scotland.

    During the first ten years of the programme 82 young eagles were released on Rum. As the eagles began moving around the Scottish western seaboard RSPB Scotland had responsibility for finding, monitoring and protecting their newly occupied territories.

    The population increase remained slow and by the early 1990s the number of sea eagles was still low. As a result SNH released a further 58 young eagles from Norway in Wester Ross. More recently further releases took place in east Scotland between 2007 and 2013. The first successful breeding here took place in 2013.

    One of the young sea eagles released in east Scotland in 2007

    Since the late 1990s, the rate of increase of the new Scottish population of sea eagles has been as high as anywhere recorded – testifying to how well suited Scotland’s environment is for these majestic birds - and how much they were a missed part of our native fauna.  

    Last year was a cause for much celebration for the reintroduction programme – as well as being 40 years since it began and 30 years since the first chick fledged the nest, 2015 saw the Scottish sea eagle population reach 100 pairs, a highly significant milestone. The 100th pair nested on Hoy, the first pair to do so in Orkney for more than 150 years. The same pair has returned again this year.  

    Looking forward there is now no immediate need for further reintroductions to sustain the Scottish population, and sea eagle numbers can be expected to continue increasing steadily in future towards a natural population level reflecting environmental conditions.

    RSPB Scotland will continue to work with our partners to monitor sea eagles but the progress that has been made to date is incredibly significant. It signals that sea eagles are firmly back as a fascinating and treasured national wildlife species for everyone in Scotland, and all who visit here. This has been one of the most successful species conservation programmes in European history – and it has been made possible by the sustained support and backing given to RSPB Scotland and our conservation partners over many years.

    The return of our sea eagles is shining demonstration that, with the right partnerships, political will, backing and determination, conservation efforts can deliver spectacular results. Now these magnificent birds again soar through Scottish skies.  

    Sea eagles across Scotland

    Skye’s sea eagles have had an interesting year so far reports Alison MacLennan:

    It’s been a roller coaster of a winter and spring for the white-tailed eagles on Skye.  Frequent storms and high winds gave way to April showers and cold northerly blasts, but this did not deter the birds from getting on with egg-laying. However, 28th April took us all by surprise, when wet heavy snow fell continuously for nine hours – the snowiest and one of the coldest days on the island since winter 2014/15.  Not surprisingly, a few of the breeding attempts didn’t survive this spell, but the stronger, committed, hardy parents soldiered on to face the next extreme weather challenge.  Who would have believed that within 11 days of the snow we would have our hottest May day on record and that Skye would be the warmest place in the country and some say even warmer than Spain on that occasion?  That was how it was on 9th May, when adult white-tails were observed panting in the shade to cool off from the un-seasonally hot temperatures, with Skye baking in 26oC!

    Enjoy a date with nature on Skye with the Kylerhea sea eagles – find out more.

    Dave Sexton gives us an update Mull’s sea eagles:

    An exciting development on Mull this year has been a new trial partnership with two community owned forests which have nesting sea eagles. The Mull Eagle Watch project which comprises RSPB Scotland, Mull & Iona Community Trust, Police Scotland, SNH and Forestry Commission Scotland has now joined forces with the NW Mull Community Woodland Co Ltd and SW Mull & Iona Development to show both visitors and residents breeding sea eagles at the nest. With two rangers employed, the two hides at West Ardhu near Dervaig and in the Tiroran Community Forest are proving to be very popular this year and both nests have now hatched. By working closely with the community owners, managers and local contractors, RSPB Scotland has helped to ensure that harvesting and haulage can continue whilst also allowing the eagles to nest successfully. The project will run until the autumn at which point the income from the trips will be split equally between the two forest groups to spend on a range of projects in the local Mull community.

    Why not see the Mull sea eagles for yourself? Details on how to visit are here.


  • Five facts you should know about nuthatches

    Five facts you should know about nuthatches

    Nuthatches were once restricted largely to south-eastern England but, during the 20th century, they started spreading north. Nuthatches started breeding regularly in Scotland only in 1989. If you have them visiting your garden, or you've seen them at a nature reserve or while out on a walk, you'll know they're pretty bold and are able to stand their ground fairly well against other birds.

    Agile and busy are two further traits nuthatches seem to carry, but here are five facts you may not know about them.

    Nuthatches are extremely versatile

    Nuthatches are able to climb both up and down the trunk of a tree. This is unlike, for example, treecreepers which are known for being able to walk up a tree. Nuthatches can go in both directions, as well as all around the trunk, because of their strong legs and feet. They use this strength for added mobility rather than relying on their tail for support and balance like other species.

    What’s in a name?

    The word nuthatch comes from the original Middle English ‘nuthak’ which literally means nut hacker. This term refers to the way nuthatches would secure a shell (by wedging it into the crevice of a tree) and then hammer away at it with their bills to get to the kernel.

    Eurasian nuthatches are spread far and wide

    There are upwards of 20 species of nuthatch in the world, but the one we get in Scotland is called the Eurasian Nuthatch. This species has the largest breeding range by far, extending across Europe to Japan in temperate climates, taking in the UK, Russia and the Mediterranean basin.

    Those nuthatches are organised...

    Nuthatches are known for storing food. They'll often take seeds from bird tables and feeders and squirrel it away elsewhere. Nuthatches are territorial birds and if they've got food hidden for a rainy day that only strengthens their need to protect their patch. So, if you've been out planting seeds in the garden lately, and you've got nuthatches around, you may notice plants popping up in places you didn't expect.

    And they like a personal touch

    Nuthatches are perfectly capable of crafting their own homes, though they will readily adopt nestboxes if they are available too. However, if they choose the latter, they still can't resist putting their own personal stamp on the place. Nuthatches will plaster mud around the entrance hole to a nestbox, even if it was the right size to begin with. You would see this same behaviour if they were using a natural tree hole that was too big for their purposes.

    If you'd like to provide homes for nuthatches where you live, or to get ideas for building homes for other birds and wildlife, click here.

  • Calamitous chorusing

    Charlie McMurray is an intern at RSPB Scotland working on 'all nature' projects: mammals, amphibians and insects. Here is her latest blog on natterjack toads from RSPB Scotland Mersehead.
    Calamitous chorusing

    It’s time! April not only brought showers to Scotland, but also lured our charismatic natterjack toads (Epidalea calamita) out of their winter burrows. Natterjacks will happily dig into the earth, unlike common toads, and have different burrows depending on the season. In winter, the toads may be buried into the sand dunes here at Mersehead.

    During the breeding season (April to June), they burrow much closer to their breeding pool, minimising their commuting time and maximising their chances to mate.

    Males move first, so in late March and early April, these prospective homemovers were probably peering out of their winter hibernacula, considering two things: females and food.

    Once they’re snug in their new poolside homes, they start to become more active at night. The males give away their whereabouts quickly because they call loudly from the pools to attract mates. Their calls give a female an impression of their size and, therefore, the suitability of their genes for her offspring. Presumably, ‘bigger is better’ in the world of natterjacks.

    Each male wants to be heard, so one call prompts another, and another, and so on. This vocal jostling forms an immersive chorus that carries far and wide. In fact, they’re the loudest amphibian in Europe. At Mersehead, all I have to do is pop my head out of the window to know what they’re up to.

    Here’s a clip of our very own amphibious choir. See if you can pick out any individual voices (and the winnowing snipe!). Credit Roseanne Watt.

    Calling certainly has one major benefit – the promise of progeny, but it also has significant costs. The noise not only entices females, but unwanted visitors too. Calling en masse provides protection by hiding the toads amongst one another, as zebras do in a herd. In such a herd, you attract more predators than when you’re alone, but the likelihood that you’ll be the unfortunate victim is much smaller.

    As with birds, each frog and toad species has its own identifiable call. Typical mating calls are generally produced simply by pushing air back and forth between their lungs and their expandable air sac. The air runs over their vocal chords, creating the sound, and the air sac amplifies it. Natterjacks have just one sac below their mouths, but some frogs have one on each side of their head or none at all.

    Attracting mates isn’t the only vocabulary the toads have though. For example, even though the males try to space themselves out in their pools to avoid being confused for a receptive female, mistakes do happen. For such times, they have a specific ‘squeak’. Unwilling females also utter this complaint.

    Here’s the big news: Mersehead’s natterjacks are out and about! On the night of Saturday 9th, one optimistic male soloist was heard, but on Thursday 14th, we saw and heard about 30. The chorus isn’t in full swing just yet because the night-time temperatures are a bit low, but it’s a positive sign for this year’s surveys. Each night, we use the chorus to pinpoint where the toads are, so I’m looking forward to seeing some soon.